Delete multiple entries from a MySQL table

To delete multiple entries from a MySQL table, use JOIN. Let us first create a table −

mysql> create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100)); Query OK, 0 rows affected (0.69 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.23 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris     | | 2 | Bob     | | 3 | Mike | | 4 | Adam       | | 5 | Bob | | 6 | Adam | | 7 | Bob | | 8 | Mike | +----+-----------+ 8 rows in set (0.00 sec)

Following is the query to delete multiple entries −

mysql> delete DemoTable    from DemoTable       join DemoTable tbl on DemoTable.FirstName= tbl.FirstName       where tbl.FirstName = 'Bob'; Query OK, 3 rows affected (0.15 sec)

Let us check table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 3 | Mike | | 4 | Adam | | 6 | Adam | | 8 | Mike | +----+-----------+ 5 rows in set (0.00 sec)